If you don't have a printer you will need to print your return, you can try printing it at a family or friend's house. Here are steps you can also take for when you don't have a printer.
Well it would be great if I could just simply go to a friend's house or family member but we are in a pandemic right now and are told to stay home. Libraries and other places that offer print services ate closed... You would think with everything going on right now that EVERYONE should be allowed to e-file so no germs are being spread by anyone filing their taxes. The whole print and mail thing is just stupid.
Why are you printing and mailing your tax returns? Why don't you e-file?
See this TurboTax support FAQ for changing from mail to e-file - https://ttlc.intuit.com/community/e-file/help/how-do-i-change-from-mail-to-e-file-in-turbotax-online/01/26985